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H. A. STEEN. swncmws MECHANESM.

APPLICATION FILED MAR 3I 912. 1,1 94,564. Patented Aug. 15, 1916.

2 SHEETS-SHEET 1- UNITED STATES PATENT OFFICE.

HALFDAN A. STEELE F NORWOOD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 ALLIS-CHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

SWITCHING MECHANISM.

L194 56 Specification of Letters Patent. Patented Aug-. 15, 1916. Application filed March 23, 1912. Serial N 0. 685,717.

Yb all ctr/1.0m. it may concern: mentary elevation, similar to that shown in. Be it known that l, HALFDAN A. STEEN, Fig. 1, with the parts shown in off position; a SlllJJOCi; of the King or Norway, residing at and, Fig. 4 1s a sectional View of a detail Norwood, in the county of Hamilton and taken along the line l-of Fig. 1.

State of Ohio, have invented certain neW The details of the starting controller so and us Mechar. clear, and

This invention relates to potential starters standing thereof. l

for alternating current motors and particu- The normal operation of the potential. 65 larly to potential starters having means restarter is substantially in the same direc-- sponsive to abnormal circuit conditions with tion, a movement through 180 constituting time element attachments. a complete operation. The controller drum. In the operation of potcntial'starters, it is 10, which is immersed in oil in the tank 11 fo l.mprovemcnts in Switching proper will not be'fully described herein be- 01 inch the following isafull, cause they form no part of my present in- ..ct specification. ventlon and are unnecessary to an under desirable that such starters be moved into is moved by an operating handle 12 through 70 off positions when in running position in rea shaft 13 and gear wheels 14: and 15. The spouse to abnormal circuit conditions. Such two opposite halves of the controller drum potential starters can be moved backward are identical in structure and each half cofrom sta pos' n to oil position without operates in turn with each of two sets of condangei-to th l s, but to avoid intact fingers 16 during successive operations 2 jury to the switch is necessary that of the controller, the sets of contact fingers the starter or switc. Lien in running posibeing on opposite sides of the drum and an tion be moved forward to off position In ranged to simultaneously co-act With thetwo potential st "ters thus :lar manufactured the halves oi, the drum respectively. The eta-- movable switch member has been thrown into tlonary contacts 15 are mountedon an in; 80.

,otf positi 11 upon the occurrence of, abnormal sulating support 17 which is located in the (lll'Clil ions without respect to the time bottonpof the stationary oil tank 11." The that "rial conditions have existed. switch drum 10 with Which these contact line This J i .r pots nial starters thus far gers cooperate is rotatably mounted in bear.

used, it has been necessary to again actuate ings 18 formed in the lower part of a large 85 the potential starter through its starting irregular shaped casting 19, which forms a and into its running position after the .oc portion of the cover for the oil tank, the rc-- currence of ev circuit condition. maining part 20 of the cover being of'sheet It th refers l" my invention metal and secured over the part 19 The to improve po s and switches by shaft 13 upon which the handle 12 and germ ac provid- 1g the... 1.1 .h an arrangement to 1 1 are mounted is supported in another bean prevent the opening of such starters or ng portion of the irregular shaped castswitches upon the occurrence of low or n0- mg 19. voltage circuit conditions until or unless said. Mounted upon the drum shaft 2l'is a cam abnormal circuit conditions have existed 22 upon which a roller is adapted to ride. a predetermined time. The roller is mounted in the casting 26 which The various novel features 0" my invenis p *otally mounted on a rod 27 and Whic tion 'wil be apparent ro1n the ecilication is provided with a finger 28 adapted-to enand dr mg". and will be particularly set gage a stop 29 forming a part of the casting forth in th appended claims. 19. Secured to the finger 28 is one end of a 1G0 The invention is illustmted 0n the accomspring 30, the other end of which is secured panying shee if drawings, in which to a portion 31 of the casting 19 by .a bolt 3 Figure 1 is an end elevation, of a poten- This sprlng 30 presses the roller25 against tial starter embodyin my invention, one end the surface of the cam 22 under all condi- Q of thetanh being broken away for the sake of tions, biasing the movable switch member or 195 clearness, and the switch being in running drum to oif position. Also secured to the position; Fig. 2 is sectional view, most of drum shaft 21 is acatch'33 adapted, When the the parts being shoi i in elevation, of the potential starter is in running position, to be same potential start taken along the ir held by a. Weighted latch 34 which is piv- I regular line 2 2 of I 1; Fig. 3 is airagotally mountedona rod 35 and whichis'pro- 0 piston lfi lofter videcl with an 1111-111 36 are intsgi all in running 3 siuion.

A llflillllwij being pin;

ulipted to smell smriinng' L'LCL "1 osi't-ioii. il'i'or minimal 88 engages This liamnior magnet" 13 (511E3- it liolcl" 'the hammer AEZ'LQ -QTS agz ii st the core 1 t when said. l'ilflgili) becomes clonei'gi -.-1n1ti.1; :e o 21102: 138 o Lin weight find the p i0, has a toncleiic oial point l to engage 211' 11 L6 f2 the latch 23% to permittlio switch r 1 1 Tu -r- (3 thrown into on posit-o. 1511B liistoacl o1 rapidly rotating under its own Weight 21110. about-its pivotal point $0, the i i-m is caiusodlo'movo slowly by a time element,

attachment. This time element attachment preferably takes the form of & (lash-pot the st L'ionaiy member l3 which is providezl with a box-oil portion il-l, plll'll 0. said bored portion being groovod. to form aii ways to permit a quick movement of the its rear end has pass'ecl to Word the'open end. 17 the clash-pot :i min amount. The piston is provided with a i-ost-i'ioted'air passageway 53 soonesting the opposite si-ios of p slon incl also with. rocl v12 1 cli o i- .lQlECl to the hammer sum: w rillion, uncle: iio-voltage or certa'. go c011- clitions, sloivl drawssai i out the stationary part of the (lash-pot. This tionni'y member l3 of ti o (lash-pol is. pivot ally mounted at &8 to the irregular Sllfiklfid casting 19, and is provided with a valve l9 which permits cl 2 Qsoa-po of air from but prevents the admission of air to the normally closed encl of said (lash-pot through said \"illNE.

Due to the position of the ivota l point of the lizui inor ai'i'iiu-ture when gngemont with the imgiie'i co -'3 li is biased by is own 'veigiil to rotate. filo pivolnl point l0 and to lllji'; inon't with member 36 the pin-pose above sotfoi'tli. "il itli the pownlaiil (31" swiloh in :unniig position llis of 21-8 is held agaiiisiz the an Let con; 1 I

I loosening;

passngeholding said s i Z; coil oulal iii cs1 on ll y Aloe:

the minutiae i i a wk by tho action. oi C coal to he sore coil; co predetermined, limo Zll moveil slowly by iiitil tho pistoi,

to pass iiim H om be mode a: a dus said swito lilo time element able value by opening 01 1e; or if as tho caso' may b xi: in the piston 4C6. in illiOllliltlfllllly Qppei'l, too i fillJ-Ql may be tripped H1; i l lover lll'3ll is PETE). Ctfikl to ob. Ell.

. this "iarlioulurly ado with potential m ODUGCLlOIl with sw .ontsi'i'oilgonient is V 1% iii. commotion il mo lio used in lies of all. typos which mro esponsive to low;- Y o? lo-voltage circuit coocjlitim- IEKL V ALLEY? Y 2mg cl cover all sun A moms whit? do not and. scope o: my iiijmntion the appended claims,

l v'l'ia'b I claim as "now I 1. 1n. poleii iil starter, the combination of a momblo 1171 ZIlQIlll means for l; moinlizei iii certain position a member biased to one position "111'; normally hold iii another posit on. out of l lioldii mans,

holding means,

with. the piston of said ber, means for holding said switch member in" a certain position, an electromagnet having a pivoted armature normally held out of engagement with said holding means and responsive to abnormal circuit conditions, said armaturebeing movable on the occurrence of abnormal circuit conditions to trip said holding means, and means for retarding the tripping action of said armature while permitting said armature to deliver a hammer blow to said holding means to effectively trip the same on the existence of said abnormal conditions for a predetermined time.

3. In combination, a movable switch member biased to one position, means for holdmg sa1d swltch member in another POSltlOIl,

an electro-magnet having a pivoted armature normally held out of engagement with said holding means and movable in response to abnormal circuit conditions to trip'said and means operative to retard the efi'ective movement of said armature until said abnormalcircuit conditions have existed for a predetermined time while permitting unrestricted final movement of said armature whereby the latter delivers a hammer blow in tripping said holding means, said retarding means comprising a dash-pot and a member directly connected to said armature and operatively associated dash-pot.

4. In combination, a movable switch member biased to one position, means for holding said switch member in another position, means for releasing said holding means com prising an electromagnet and an element held in inoperative position thereby during normal circuit conditions, said element being mechanically independent of said releasing means and biased to a position wherein itis engageable therewith to actuate said releasing means said element being movable toward said latter position on the occurrence of low voltage circuit conditions, and means operative to retard the initial part of such movement while permitting free and unrestricted travel during the latter part of such movement. 5. In combination, a movable switch member normally retained in one position, and means for causing the actuation of said switch member to another position, said latter means comprising a member movable in response to abnormal circuit conditions and effective to produce a hammer blow in the actuation of said movable switch member, and means associated with said member for insuring a retarded initial movement thereof and an unretarded final movement thereof.

6. In combination, a movable switch member biased to one position, means for hold ing said switch member in another position,

with said switch member and engageable with said armature for resetting the same.

7. In combination, a niovable switch member normally retained in one position, means for controlling the actuation of said switch member to another position, said latter means comprising a member movable in response to abnormal circuit conditions, and means associated with said member for insuring the retardation of effective movement thereof for a definite time interval on the occurrence of said predetermined conditions while permitting'an unretarded final movement thereof effective to produce a hammer blow in its action of controlling the actuation of said switch member.

8. In combination, a movable switch member normally retained in one position, means controlling the operation of said switch member to another position, said latter means comprising a member normall held in inoperative position during the existence. of normal circuit conditions-and operative on the occurrence of abnormal circuit conditions to exert its controlling effect on the operation of said switch member, and means associated with said member for insuring that effective operation of said member is retarded until said abnormal circuit conditions have existed for a definite time interval and that the'final movement of said member is substantially unrestricted.

9. In combination, a movable switch member normally retained in one position, means for controlllng the actuation ofsaid switch member to another position, said latter means comprising an element movable in response to abnormal operating conditions, means associated with said element for insuring the retardation of effective movement of said element for a definite time interval on the occurrence of said. abnormal operating conditions and the unrestricted final movement of said element to produce a ham mer blow in the operation of said element, and means operable on movement of said setting said element.

Milwaukee, Wis, l\Iarch 12, 1912.

In testimony whereof I afiix my signature, in the presence of two Witnesses. I

HALFDAN A. STEEN. Witnesses:

LOUIS C. NICHOLS, FnAsnn JEFFREY,

switch member to said first position for re 

